Belt



y 30, 1933- I A. FREEDLANDER 1,911,496

' BELT Filed April 16, 1951 ,1 nzlczzld U U IN V E N To R I ABRAHAM 1.. F/PEFDMA/OE/Z 4; B Y A /a A Z Patented May 30, 1933 UNITED STATES ABRAHAM L. FBEEDLANDER, OF DAYTON, OHIO Application filed April 16, 1931. Serial No. 530,534.

My invention relates to belts. It is the object of my invention to provide a belt having a wrapper of straight laid material such as textile fabric, embracing less than the four sides of the belt in order to permit of flexibility of the belt so that it can pass over pulleys of small diameter and can be used in short center drives, While at the same time still utilizing a straight laid fabric wrapper, which hitherto has been found impractical with belts of this character necessitating the use of a bias laid wrapper in order to prevent buckling, ripplingand injurious heat effects in the belt.

I have discovered that by using a belt with a three-sided wrapper providing flexibility ofthe wrapper on the sides of the belt and at least the bottom and the top of the belt free of a wrapper, I am enabled to get the protective action of the wrapper without preventing the belt from being sufliciently flexible for the above purpose. This is particularly essential in a belt having a neutral axis of in extensible cords arranged in transverse layers from side to side of the belt and forming a transversely, as well as longitudinally, inextensible rigid structure.

' I also desire to employ in such a belt a compression section and a tension section, preferably employing straight laid fabric in the tension section This sets up anotherproblem of similar character and makes it difiicult to provide a belt that is sufiiciently flexible that will not disintegrate due to the buckling of the belt, will not setup excessive heat, and will not squeeze itself out of the V-shaped groove of the pulley.

It is a further object to accomplish my invention by having a wrapper completely enclosing the belt but having portions cut away on the sides and top, or partially on the sides and top of the Wrapper.

It is a further ob ect to provide such a belt having cut away portions of different designs, forms and configurations.

Referring to the drawing, Figure 1 is a. section through my belt showing a three-sided wrapper with the top of the belt exposed.

Figure 2 is a similar view with the bottom of the belt exposed.

Figure 3 is a perspective of my belt with a wrapper completely encircling it and with portions of the wrapper cut away.

Figure 4 is a bottom plan view of the belt shown in Figure 3.

Figure 5 is a section 011 the line 5-5 of Figure 3 showing the straight laid fabric in the tension section of the belt.

Referring to the drawing in detail, 1 indicates a compression section of a. belt that is a trapezoid in section. This compression sect1on is preferably composed of rubber and fine fabric members designated 2. Woven fabric may be employed in this compression section if desired. Wound in concentric layers on the compression section are a plurality of cords 3, suitably embedded in rubber .4.-. Wound on the cords 3 are a. plurality of spaced layers 5 of straight laid fabric. Layers of rubber 6 are interposed therebetween. 70 It will be understood by a straight laid fabric I mean a fabric in which the warp and woof threads are arranged respectively parallel to the longitudinal axis and transversely thereof of thebelt.

I provide a wrapper for. the belt comprising a layer of straight laid fabric 7 which may be wrapped around three sides of the belt as in Figures 1 and 2 or be applied to the side walls or driving surface of the belt only, or may be wrapped completely around the belt as in Figures 4 and 5, in which belt slots are cut in the straight laid wrapper. The wrapper is impregnated with rubber as at 8.

Referrin to the neutral axis cords 3, it will be un erstood that these are applied under tension and are vulcanized in that con- 'dition. They are so closely located with respect to one another that they form a rigid transverse bridge across the belt, thereby preventing lateral compression. The prestretching that these cords have insures them against longitudinal extensionf Hence I provide a neutral axis rigid longitudinally and transversely, a compression section 1 that will compress as the belt passes over a pulley and a tension section comprising the straight laid fabric layers 5 and the rubber layers 6. This tension section can stretch as the belt passes over the pulley and is facilitated in 100 doing so, despite the fact that I use a straight laid fabric, by allowing the upper portion of the belt to be exposed without awrapper, or with a wrapper that is cut away, as shown in 5 Figure 3.

These cut away portions or slots are designated 9 on the top of the wrapper, 10 on the sides of the wrapper, and 11 on the bottom of the wrapper, while 13 designates a slot on 10 the bottom of the wrapper extending around the corners 14 of the belt onto the sides 15 of the belt.

I desire to comprehend within my invention such modifications as may be clearly embraced Within my claims and the scope of my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In combination, a belt comprising a neutral axis section, a compression section, a tension section of straight laid fabric, and a wrapper encircling said belt having portions of said wrapper cut away.

2. In combination, a belt comprising a neutral axis section, a compression section, a

tension section of straight laid fabric, and

a wrap or encircling said belt having portions 0' said wrapper cut away, said neutral axis section being comprised of a plurality otf longitudinally inextensible and transversely incompressible cords.

3. In combination, a belt comprising a ten-.

sion section of rubber with a plurality of fine fibers intermingled therein, a plurality of neutral axis inextensible cords, a plurali-.

ty of layers of straight laid fabric and rubher, and a straight laid fabric wrapper encircling said belt having slots cut therein.

49 In testimony whereof, I aflix my signature.

ABRAHAM L. FREEDLANDER. 

